Saw-clamp.



G. S.- STEVENS.

SAW CLAMP.

APPLIDATIONTILED DEO.7,1905. itya Patented May 31, 1910.

2 SHEETS-SHEET 1.

C. S. STEVENS.

SAW CLAMP.

APPLIUATION FILED DB0. 7.1905.

Patented May 31, 1910.

2 SHEETS-SHEET 2.

fifi/265865).'

NIT li CLAYTON S. STEVENS, OF NEW BRITAIN, CONNECTICUT.

ENT @FFIQE.

SAW-CLAMP.

Specification of Letters Patent.

Patented May/,31, 1910.

To all whom 'it may concern.'

Be it known that I, CLAYTON S. STEVENS, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements in Saw-Clamps, of which the following is a specification.

This invention relates to clamps for saws, and has for its object theprovision of improvements in such devices, whereby circular saws ofdifferent diameters may be securely held in position, and adjustedtoothby-tooth when said clamp is released after the iiling operationupon a tooth.

A further object of the invention is the provision of a detachableconnection for the movable clamping-jaw, whereby it may be withdrawnbodily after a tooth has been sharpened, thereby avoiding all danger ofinjury to said tooth when the saw is indeXed to bring an additionaltooth into place for operation. In this connection it is proper to statethat some saws have teeth so formed or swaged that they projectlaterally on each side, and, therefore, space for such teeth must berovided for when the saw is adjusted to bring an additional tooth intoposition for operation. In other words the saw-tooth must be free of theclamp before it is advanced to bring another tooth into place foroperation, and this is accomplished in the present case by moving theclamping-jaw bodily away from the sawtooth after it has been operatedupon, thus aording free space to enable the next tooth to be broughtinto position without interference with any part of said clamp.

Further objects of the invention relate to a gage or stop pivotallysecured to one of the jaws of the clamp; to means for angularlyadjusting said clamp; and to the general details of construction of thedevice, as will be hereinafter set forth.

In the accompanying drawings, Figure 1 is a side view of a saw-clampembodying the features of the invention. Fig. 2 is a rear end elevation.Fig. 3 is a plan view. Fig. 4 is a section on line 4-4 of Fig. 1. Fig. 5is a view, partially in section and partially in elevation, of the arborand cone upon which the tool to be operated on is held whencircular-saws vare to be sharpened or otherwise operated upon. Fig. 6 isa partial section on line 6 6 of Fig. 1.

Like characters designate similar parts throughout the several views.

Referring to the drawings, the numeral 5 designates the frame or body ofthe clamp, which is shown as a casting having lateral o'sets 6 and 7,respectively, separated to receive between them the part of a support(not shown) to which the clamp may be secured by a screw or other device8 carried by the loweroifset 7 A longitudinal groove or channel 9 isformed in the front of the body 5, and a slot9 (see dotted lines Fig. 2)opens into saidchannel and passes through an inclined vreinforce at theend of which the offsets 6 are located. At its top the casting 5 isprovided with perforatedears 5 in which are threaded screws 10 havingconical tips 10, said screws :being locked against rotation by jam-nuts11, as shown in Fig. 4.

Referring more particularly to Figs. 1 and 2 the'numeral 12 designatesan eXtension or standard depending from the fixed jaw 13 of the clamp,said fi-Xed jaw -being connected with said extension by a curved offsetneck portion 12, and the extension having a lslot or groove 122 for apurpose hereinafter stated. Extending laterally from said fixed jaw 13is an arm or bar 14 having perforated-ears 14 at its -rear end for apurpose hereinafter described, said bar 14 being channeled throughoutits length at 142, as illustrated in Fig. 3, and the channel merging inthe space between the ears 14.

Designated by 15 is the movable jaw of the clamp, said jaw having ears15, separated to receive between them the end of an arm 16, theconnection of the arms and jaw being established by a pivot 17. It willbe seen that the two jaws are elongated in a direction transverse to thestandard or extension 12. At its rear end the arm 16 is curved at 16 andthen projected forward at 162 parallel to the arm 14 against the wallsof the channel of which it snugly lits. A perforated reinforce or boss18 projects from each side of the curved part 16 of arm 16 and theflattened sides of said reinforce enter the space between the ears 14,to which the arm is secured by a removable pivot-bolt 19 having anger-grasp 19. At its free end the arm 162 is provided with aninternallythreaded boss 2O into which is inserted a screw 21 having agrasping-wheel or handle 22. At its outer side the arm 14 of the fixedjaw 13 is channeled at 142 to receive the arm 162 the end of the screw21 bearing against the bottom of the channel, and the sides of saidchannel serving as guides to receive between them, and prevent fromwabbling, said arm 162. By turning the screw 21 the arm 16. may be movedon its pivot 19 to actuate the movable jaw 15 toward the fixed jaw 13,and by withdrawing pivot 19 the arm 16 and movable jaw may be slidlongitudinally to carry said movable jaw away from the ixed j aw, thearm 162 during this action traveling in and being guided by said channel142.

Projecting from the back of the T-slotted bar 12 is a sector 24, whichpasses through the slot 9 in the casting 5, and is notched in its edgeat 25 for the reception of the nose 26 of a detent or pawl 26, said pawlbeing actuated by a spring 27, and having a leverarm or handle 262. Itis frequently necessary to adjust the saw and the clampingjaws at anangle, and this may be accomplished by releasing the pawl 26 and thenswinging the arm 12 and the parts carried thereby on the trunnions 10,and when the desired angular adjustment has been made the nose 26 of thepawl will snap into one of the notches 25 and lock the sector in place.

In the channel 122 of depending bar 12 is mounted for sliding movement aT-nut 28, and threaded into said nut is a bolt 29, having a collar 30intermediate its threaded sections 29 and 292, said bolt also having anangular section 293 above the threaded section 292. Threaded upon thesection 292 of the bolt isa cone or stud 31 having a series ofconcentric steps 31 of dierent diameters, said cone being chambered at312 to lit over the collar 30 and having a flat base 313 resting uponthe top of the slotted bar 12. In the end of the cone opposite its baseare recesses 32, to receive pins 33 projecting from a lever wrench 34.This wrench is chambered at 33 to receive the end of the threadedsection 292, and opening into said chamber is a passage 35 of the shapeof the angular extension 293 of the bolt, over which it is slipped. Athumbscrew 36 is threaded into the wrench and serves to lock the same tothe extension 293 of' the bolt 29.

Circular saws are of different diameters and have diierent sizes of hubor central openings to receive their arbors. In virtue of theconstruction just described any size of saw may be iitted lon the cone31, and-may be rotated step-by-step, on the step 31 upon which it istted.

To adjust the bolt 29 up or down in the slot 122 of bar 12, the screw 36is released, and the lever-wrench 34 is moved along the extension 293,thereby withdrawing the pinsy 33 from their seats in the cone 31, afterwhich the screw is again tightened and the bolt is turned by the wrenchto release the nut 28, when the bolt may be adjusted along the slot tothe position required, after which the nut is again tightened to lockthe bolt in the T-slot, and the saw being placed upon the step of thecone, the lever-wrench (which was withdrawn to enable this to beaccomplished) is again slipped over the bolt, its pins 33 enter therecesses in the end of the cone, and the wrench is again secured by thescrew 36. Y I should state that, and this will be understood from whathas been previously set forth, my device comprehends a stud forrotatively supporting a circular saw and two jaws operatively associatedwith said stud, said jaws being of such a nature that they rigidly clampthe saw for a portion only of its peripheral extent and on astraight-line plane intersecting said periphery at two points. Thisprovides a construction whereby a circular saw can be rigidly clamped atthat part which is being filed and it will be clear that I can provide amuch simpler construction for properly holding a saw than is present inthose clamps comprising circular jaws.

Gages and surfaces upon which the sawteeth rest are necessary in thisclass of devices and one form among many that could.

be employed is illustrated in'Figs. 1, 2 and 3, said gage andling-surface being below described.

To the top of the lateral arm 14 of the fixed jaw 13 is adjustablysecured by a screw 37 a slotted plate 38, and to this plate is hinged,so that it may be swung out of the way of the saw, when desired, a gage39. This gage must be provided with a suitable stop to limit the motionof the saw, and in the present instance this is rovided for by forming aslot 40 in an inc inedr or beveled front face 41 on the free end of thegage, said surface serving as a table upon which the tooth is sharpenedby a file, or as an anvil upon which the tooth may be drawn out byswaging. This beveled or inclined surface terminates in a flat top 41from one side of which the shank 412 extends, said shank being pivoted'to the block 38.

To limit the height of the gage above the reinforced top of the pivotedbar 12 any suitable adjustable rest may be employed,

that shown being'a rod 42 mounted in a bore of the top ofthe fixed jaw18 and retained in any desired position of vertical adjustment by ascrew 43.

In Ause the clamp is secured to a support, the saw to be sharpened isplaced upon the step 8:1fof the cone fitting the opening in its hub, andits blade is lintroduced between the open jaws of theA clamp, the toothto be filed or otherwise treated entering the slot 40 of the gage 39,and the edge of the tooth beneath the cutting-point thereof abuttingagainst the rear wall of said slot, which acts as a stop. Screw 21 isnow turned by means of its hand-wheel 22, and the movable jaw 15 iscaused to clamp the saw-blade tightly against the fixed jaw 13. Owing tothe position of the screw 21 in the end of the shorter arm 162, and asits end bears against the arm 14 of the fixed jaw it will be seen that apowerful clamping action will be applied to said movable jaw, and thesaw will be rmly held against displacement.

After a tooth of the saw has been inserted in the slot 40, as aforesaid,it may be readily sharpened by a file in the usual manner. The inclinedsurfaces of the gage and the top straight surface of said gage servingas supports for a tooth during the sharpening operation. By clamping thesaw with its tooth projecting over the flat surface of said gage, thesides of the tooth may be peened or drawn out by a hammer if desired.After one tooth has been sharpened the screw is turned to release themovable jaw and the saw is rotated to bring another tooth into positionto be treated in the same manner.

Should it be desired to withdraw the movable jaw bodily from the fixedjaw, this may readily be accomplished by taking out the pivot-bolt orpin 19, and sliding the lever-arm 16, 162 and the movable jaw to therear, thus avoiding the necessity of entirely removing the movable jawwhen it is d-esired to inspect t-he saw, or to remove it, and placeanother saw in position, the channeled guide back of the fixed jawserving to prevent displacement of the arm 162 when this resultisaccomplished. By pivoting the gage in the manner described it may beswung up out of the way when it is necessary to rotate the cam to bringa new tooth into position, and in View of the fact that the bloclr 38 towhich said gage is pivoted is slit, and is secured to the arm 14 bymeans of a screw 37, it is obvious that the gage .may be longitudinallyadjusted and may also be swung around on its pivot if desired.

Should it be desired to set the clamp at an angle this is readilyaccomplished by releasing the detent 26 and swinging the hanger 12carrying the clamp upon its trunnions 10, the degree of angularadjustment being controlled by the position of the detent in any of thenotches 25 of the sector 24.

As will be observed the stepped cone 31 is threaded upon the bolt 29,and it is, therefore, capable of vertical adjustment upon said bolt.

By applying a wrench to the squared end of the vbolt the nut 28 will beclamped in position lat any vpoint desired along the groove 122-'of thebar or hanger 12.

While primarily designed for sharpening the teeth of circular saws it isdistinctly to be understood that the invention is not limited thereto.Furthermore the teeth of smoothing, clearing and other types of circularsaws may be readily sharpened in a device of the character described.Bandsaws, fiat-blade saws and in fact many of the types of saws incommon use may also be held in the clamp and have their teeth sharpenedwith ease and despatch.

Changes may be made in many of the details of the invention withoutdeparture therefrom. For instance, various means different from thoseshown may be employed for retaining the bar or hanger to which the jawsare secured in an angular position and the saw may be held on saidhanger and adjusted longitudinally thereof by means widely varying fromthose shown.

Without limiting myself to the precise details shown and described, whatI claim 1s- 1. The combination of a standard, a pair of jaws elongatedin a direction transverse to said standard, a saw-supporting stud onsaid standard, an arm extending from said standard in the same directionas the elongation of said jaws, and a swinging member supported by saidarm, one of said jaws being rigid with said standard and the other beingsupported for swinging movement by said swinging arm, the two swingingparts turning about parallel axes transverse to that of said stud.

2. A saw clamp comprising a fixed jaw, a relatively fixed part to whichsaid jaw is connected, a swinging substantially U- shaped memberconnected pivotally between its ends to said relatively fixed part, ascrew tapped through one branch of said U- shaped member and bearingagainst said relatively xed part, and a jaw pivoted to the other branchof said U-shaped member approximately at one end thereof and movabletoward and from the fixed jaw on the movement of said U-shaped member.

3. A saw clamp comprising a fixed jaw, a relatively fixed part to whichsaid jaw is connected, a swinging substantially U- shaped memberpivotally connected between its ends to said relatively fixed part7means operatively associated with one branch of said U-shaped part andactive against said relatively xed part, for shifting the former, and aswinging jaw connected with the other branch of said U-shaped part.

4. A saw clamp having a fixed jaw, a swinging arm, a jaw pivoted to saidswinging arm for movement toward and from the fixed jaw on the swingingmovement of said arm, the two jaws being adapted to receive a saw in thespace therebetween, and

a gage member having a saw stop and also having a saw slot, the latterbeing adapted 15 to register with said space, and the gage member beingmovably mounted whereby when it is not in use it can be moved out of theway. v

In testimony whereof I aix my signa- 20 ture in presence of twowitnesses.

CLAYTON S. STEVENS.

Witnesses:

FRANCES E. BLODGETT, SIDNEY S. GROTTA.

